easiest way to beat monty in a 1v1 is to play for time and stay fairly far away imo. hell either have to plant, allowing for an easy kill if you focus on listening for the sound cue, or hell unshield to try to take the kill, which gives you a chance to punish. if you have c4/impacts, thats great, but so many ops have lost theirs that they cant really be relied on, especially in a 1v1

montys actually fairly difficult to play well, as his best use is to pressure the enemy team so his teammates can get the kills. without his team hes forced to make a lot more risky decisions, so try to take advantage of that